Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
It looks like you forgot to share screenshots with us here. You may use a tool like imgur to share screenshots with us. That will help us to understand the situation better.
Meanwhile, please check if the following line exists in your wp-config.php file. It needs to be set to false so Rank Math can modify your .htaccess and robots.txt files:
define ('DISALLOW_FILE_EDIT', true);
Here is a guide for your reference:
https://rankmath.com/kb/cant-edit-robots-txt/
Let us know how it goes. Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.
